Is it not a bit ironic that on the same day MS's chairman sends a message to the security industry, half the internet comes down because of a flaw in one of Microsoft's products.
Pay attention to the following:
While we've accomplished a lot in the past year, there is still more
to
do - at Microsoft and across our industry. We invested more than $200
million in 2002 improving Windows security, and significantly more on
our security work with other products. In the coming year, we will
continue to work with customers, government officials and industry
partners to deliver more secure products, and to share our findings
and
knowledge about security. In the meantime, there are three things
customers can do to help: 1) stay up to date on patches, 2) use
anti-virus software and keep it up to date with the latest signatures,
and 3) use firewalls.
STAY UP TO DATE

Perhaps the next time a worm like we have experienced this weekend will contain a destructive or backdooring payload.
Read bugtraq mailing list to see if the products you are using contains flaws.
Use the MS Baseline Security Analyzer to find what patches you might have missed.